I don't have any screenshots of battery life in Android 10, but I was getting around 1 hour less. In my opinion battery life is much better on Android 11. I am
Many told me that after Realme UI Android 10 update, I would get a bad battery life! Here's the proof, I just got nearly 9 hours after a heavy full day use
Android™ 10 Battery Settings - Covenant Eyes
How to fix Android battery drain issues and extend battery life
How's your battery life on Android 10? - Android Forums at AndroidCentral.com
How to increase battery life on Android 10 | Android Central